Enthalpy L2 🔑

Standard Enthalpy of formation

Enthalpy change when 1 mole of a substance is formed from its elements under standard conditions with all substances in their standard states.

Standard Enthalpy of reaction

Enthalpy change when a reaction occurs in the molar quantities shown in the chemical equation under standard conditions with all substances in their standard states.

Standard Enthalpy of neutralisation

Enthalpy change when an acid and base react to form 1 mole of water, under standard conditions with all substances in their standard states.

Standard Enthalpy of combustion

Enthalpy change when 1 mole of a substance is completely burned by oxygen under standard conditions with all substances in their standard state.

Hess’ law

The Enthalpy change, at constant pressure in a reaction is independent of the path taken and only depends on the initial and final states.